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Solving reverse proxy error ERR_CONTENT_DECODING_FAILED

Configuring a reverse proxy is not an easy task. It involves some trial and error and dealing with unexpected errors. One of those errors is ERR_CONTENT_DECODING_FAILED. The web site won’t load in your browser and Chrome will show this error message:

Error ERR_CONTENT_DECODING_FAILED may show up in your browser when a resource is configured on your reverse proxy, and the backend communication is working. That is: the backend is returning data, but not in a form the browser expects. Like: browser expects a GZIP response, but receives plain text. Therefore the hint content decoding failed. Content received, but the browser is not able to decode / understand the data.